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author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2018-05-23 14:17:25 +0200 |
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committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2018-06-15 13:02:44 +0200 |
commit | 65f868cac6f7fd5c3ad02046574c19f8f4673255 (patch) | |
tree | 15103fb87ed2e7161c17006e2c077f35e3506a95 /cpukit/score/cpu/no_cpu | |
parent | Add RTEMS_SYSINIT_CPU_COUNTER (diff) | |
download | rtems-65f868cac6f7fd5c3ad02046574c19f8f4673255.tar.bz2 |
Add _CPU_Counter_frequency()
Add rtems_counter_frequency() API function. Use it to initialize the
counter value converter via the new system initialization step
(RTEMS_SYSINIT_CPU_COUNTER). This decouples the counter implementation
and the counter converter. It avoids an unnecessary pull in of the
64-bit integer division from libgcc.
Update #3456.
Diffstat (limited to 'cpukit/score/cpu/no_cpu')
-rw-r--r-- | cpukit/score/cpu/no_cpu/Makefile.am | 1 | ||||
-rw-r--r-- | cpukit/score/cpu/no_cpu/cpucounterfrequency.c | 20 | ||||
-rw-r--r-- | cpukit/score/cpu/no_cpu/include/rtems/score/cpu.h | 7 |
3 files changed, 28 insertions, 0 deletions
diff --git a/cpukit/score/cpu/no_cpu/Makefile.am b/cpukit/score/cpu/no_cpu/Makefile.am index 556d3dea34..0d89f5af2b 100644 --- a/cpukit/score/cpu/no_cpu/Makefile.am +++ b/cpukit/score/cpu/no_cpu/Makefile.am @@ -2,6 +2,7 @@ include $(top_srcdir)/automake/compile.am noinst_LIBRARIES = libscorecpu.a libscorecpu_a_SOURCES = cpu.c cpu_asm.c +libscorecpu_a_SOURCES += cpucounterfrequency.c libscorecpu_a_SOURCES += cpucounterread.c libscorecpu_a_CPPFLAGS = $(AM_CPPFLAGS) diff --git a/cpukit/score/cpu/no_cpu/cpucounterfrequency.c b/cpukit/score/cpu/no_cpu/cpucounterfrequency.c new file mode 100644 index 0000000000..bbb8c127fe --- /dev/null +++ b/cpukit/score/cpu/no_cpu/cpucounterfrequency.c @@ -0,0 +1,20 @@ +/* + * Copyright (c) 2018 embedded brains GmbH. All rights reserved. + * + * embedded brains GmbH + * Dornierstr. 4 + * 82178 Puchheim + * Germany + * <rtems@embedded-brains.de> + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.rtems.org/license/LICENSE. + */ + +#include <rtems/score/cpu.h> + +uint32_t _CPU_Counter_frequency( void ) +{ + return 1000000000; +} diff --git a/cpukit/score/cpu/no_cpu/include/rtems/score/cpu.h b/cpukit/score/cpu/no_cpu/include/rtems/score/cpu.h index 5902b4ef36..45edbaa3cf 100644 --- a/cpukit/score/cpu/no_cpu/include/rtems/score/cpu.h +++ b/cpukit/score/cpu/no_cpu/include/rtems/score/cpu.h @@ -1329,6 +1329,13 @@ static inline uint32_t CPU_swap_u32( typedef uint32_t CPU_Counter_ticks; /** + * @brief Returns the current CPU counter frequency in Hz. + * + * @return The current CPU counter frequency in Hz. + */ +uint32_t _CPU_Counter_frequency( void ); + +/** * @brief Returns the current CPU counter value. * * A CPU counter is some free-running counter. It ticks usually with a |